s-7760a53xx-hct1 datasheet(28/53 Pages) SII

Part #	S-7760A53XX-HCT1

Description	PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

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Manufacturer	SII [Seiko Instruments Inc]

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PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

S-7760A

Rev.1.3_00

Seiko Instruments Inc.

28

Write Protect Function during the Low Power Supply Voltage

The S-7760A has a built-in detection circuit which operates with the low power supply voltage, cancels Write when the

power supply voltage drops and power-on. Its detection voltage is 1.75 V (Typ.) and the release voltage is 2.05 V (Typ.),

and its hysteresis is approx. 0.3 V.

The S-7760A cancels Write by detecting a low power supply voltage when it receives a stop condition.

Both in the data transmission and the Write operation, data in the address written during the low power supply voltage is

not assured.

Release voltage (

+VDET)

2.05 V Typ.

Power supply voltage

Hysteresis

approx. 0.3 V

Detection Voltage (

−VDET)

1.75 V Typ.

Cancel the Write instruction

Figure 31 Operation during Low Power Voltage

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